Research has suggested that exercise may play a helpful role in improving depressive symptoms, and several studies have explored this relationship.
One study published in the British Journal of Sports Medicine (April 2001;35:114-117) examined the effects of aerobic exercise in individuals with major depression. This small study involved 12 participants, each of whom had experienced a depressive episode lasting an average of 35 weeks, as defined by criteria in the Diagnostic and Statistical Manual of Mental Disorders. Participants exercised on a treadmill for 30 minutes per day over a 10-day period.
At the end of the exercise intervention, participants showed a reduction in depression scores as measured by the Hamilton Rating Scale for Depression. The authors concluded that even a short period of regular aerobic exercise was associated with improved mood in patients with major depressive disorders.
Additional support comes from research published in the Journal of Sports Medicine and Physical Fitness (December 2001;41:539-545). This study assessed 80 men and women who completed mood questionnaires prior to exercise. Fifty-two of the participants met criteria for a depressed mood before exercising. After exercise, this group reported increased vigor and reductions in anger, depression, and anxiety.
Dietary factors have also been explored in relation to mood. An animal study published in Biological Psychiatry (February 15, 2005;57(4):343-350) examined whether a combination of omega-3 fatty acids and uridine influenced depression-like behavior. Omega-3 fatty acids are found in fish oil, and uridine is a naturally occurring compound important for early nervous system development.
In this study, rats were placed in water and observed for swimming behavior. After a period of time, untreated rats stopped swimming and floated, a behavior commonly used in animal research as a model of depressive-like states. When antidepressant medications were administered, the rats resumed swimming. A combination of omega-3 fatty acids and uridine produced a similar effect, suggesting a possible influence on mood-related behavior in this experimental model.
Alongside interest in lifestyle approaches, concerns have been raised about the use of antidepressant medications in children and adolescents. In 2003, British health authorities reported that several commonly prescribed antidepressants might increase the risk of suicidal thoughts or behaviors in young people. Most antidepressants were considered unsuitable for children, with the exception of Prozac, although no full pediatric ban was issued.
In the United States, the Food and Drug Administration urged careful monitoring of patients—particularly children and adolescents—when antidepressant medications are started or doses are changed. This guidance followed a re-evaluation of 25 clinical trials involving more than 4,000 young participants and eight antidepressant medications, conducted with assistance from researchers at Columbia University. The analysis found that young people taking antidepressants were approximately 1.8 times more likely to report suicidal thoughts or behaviors compared with those receiving placebo.
